Canon MX870 Series User Manual page 690

(1) Bright area
More data is distributed to the
highlight side.
Adjusting Histograms (Using the Slider)
Select a Channel, then move
set as the shadow or highlight.
- All parts to the left of
(Black-point Slider) will be black (level 0).
- The parts at
(Mid-point Slider) will turn to the color exactly between the black-point and white-point.
- All parts to the right of (White-point Slider) will turn white (level 255).
When Image Adjustment is set to anything but None, the adjustments shown below are performed
automatically.
Moving the Black-point and White-point Sliders
Move the Black-point Slider or White-point Slider to adjust brightness.
Images with more data distributed to the highlight side
Move the Black-point Slider toward the highlight side.
Images with more data distributed to the shadow side
Move the White-point Slider toward the shadow side.
Images with widely distributed data
Move the Black-point Slider toward the highlight side, and White-point Slider toward the shadow side.
(2) Dark area
More data is distributed to the
shadow side.
(Black-point Slider) or (White-point Slider) to specify the level to be
(3) Whole image
Data is widely distributed between the
highlight and shadow.